using System;
class Teste
{
	static double Soma(params double[] dd)
	{
		double soma = 0.0;
		for(int i = 0; i < dd.Length; i++) soma += dd[i];
		return soma;
	}

	static void Treta(int x, int y = 88)
	{
		Console.WriteLine(x + y);
	}

	static void Main()
	{
		Console.WriteLine(Soma(new double[] { 1.9, 2.3, 4.5 }));
		Treta(100); Treta(y:10, x:3);
	}
}